One problem related to engine has been reported for the 2001 Volvo S40. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Volvo S40 based on all problems reported for the 2001 S40.
A 1010 wins new story alerted me to the fact that I am having the same exact problems with my Volvo S40 VIN#: yv1vs29521f616155. I lose speed as I am driving and the engine feels as if it is going to stop at any moment. The year of the vehicle is 2001.